This DIY project takes common parts, including a clock from IKEA and a fluorescent desk lamp, and turns them into this sweet robot voice modulator that makes even the most emotional, dramatic vocals seem cold and calculating.
This doesn't look like the easiest project we've seen; it calls for laser cutting and a significant amount of audio tech know-how. But the results are pretty much exactly what you'd want, and it's definitely a sweet-looking end result. This thing even features audio-in so you can plug in instruments, pre-recorded sounds, or anything else you want, and the pitch-shifting and vibrato buttons let you adjust the robot sounds on the fly. Check out the instructions for more info on how to sound like a robot. [Instructables via MAKE]